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<p>A decade-long (2013–2023) study of the tropical Amba estuary revealed that abiotic parameters exhibited both spatial and temporal variability across the study period. A total of 134 taxa were identified, with polychaetes dominating the assemblage (&gt; 65%). The numerically dominant species varied annually, with taxa such as <i>Nephtys paradoxa</i>, <i>Capitella capitata</i>, <i>Namalycastis senegalensis</i> showing temporal shifts in dominance, indicating species turnover. Multivariate analyses indicated pronounced spatio-temporal structuring, with salinity as the key driver of benthic distribution, consistent with other tropical estuaries. Although year-to-year shifts in dominating species were noted, the relatively stable long-term physico-chemical conditions from 2013 to 2023 clearly led to little temporal differences in species compositions, with most intermediate years remaining comparable. The estuarine ecological quality status using AZTI Marine Biotic Index (AMBI) was largely similar from 2013 to 2023, while it varied throughout the estuary, indicating spatial variability. This study provides the first long-term ecological analyses for any Indian estuary, emphasizing the role of salinity gradient and anthropogenic stressors in shaping macrobenthic communities. These findings underscore the need for sustained biomonitoring for pertinent conservation and management policies.</p>

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Decadal analyses of macrobenthos of a tropical estuary: spatio-temporal shifts, trends and ecological assessment

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Maaz Shaikh,
  • Soniya Sukumaran,
  • J Mariyam Johna,
  • Umesh Kumar Pradhan

摘要

A decade-long (2013–2023) study of the tropical Amba estuary revealed that abiotic parameters exhibited both spatial and temporal variability across the study period. A total of 134 taxa were identified, with polychaetes dominating the assemblage (> 65%). The numerically dominant species varied annually, with taxa such as Nephtys paradoxa, Capitella capitata, Namalycastis senegalensis showing temporal shifts in dominance, indicating species turnover. Multivariate analyses indicated pronounced spatio-temporal structuring, with salinity as the key driver of benthic distribution, consistent with other tropical estuaries. Although year-to-year shifts in dominating species were noted, the relatively stable long-term physico-chemical conditions from 2013 to 2023 clearly led to little temporal differences in species compositions, with most intermediate years remaining comparable. The estuarine ecological quality status using AZTI Marine Biotic Index (AMBI) was largely similar from 2013 to 2023, while it varied throughout the estuary, indicating spatial variability. This study provides the first long-term ecological analyses for any Indian estuary, emphasizing the role of salinity gradient and anthropogenic stressors in shaping macrobenthic communities. These findings underscore the need for sustained biomonitoring for pertinent conservation and management policies.